Volume of a cylinder = πr²h. Substitute r=8 and h=66: volume = 3.14 × 8 × 8 × 66 = 13263.36 cubic m. Think of a cylinder as many equal circular layers stacked up. So we find the circular base area πr² and multiply by the height. The answer is in cubic units, so the correct choice is 13263.36 m³.